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Thanks for your reply pump appears to be working ok as at the present time radiators are as they should be. System is clean. Anymore thoughts would be gratefully received

Could anyone assist with problem enountered with the above boiler. The boiler keeps coming up with F23 Fault Code. The auto air vent has been changed and all seemed well for a few days. The temperature is rising fast from cold to between 61 and 72 degrees then starts to drop and the flame...